A body is pulled along a horizontal force of 20N calculate the work done in moving a distance of 40m

Answer:

newton's first law (sorry its really late i know you prob don't need it anymore

Explanation:

The electrical power dissipated by the circuit is 575 W.

The amount of heat energy released in half hour is 0.2875 kWh.

The electrical power dissipated by the circuit is calculated as follows;

P = IV

where;

P = I²R

where;

P = 5² x 23

P = 575 W

The amount of heat energy released in half hour is calculated as follows;

E = Pt

where;

E = 575 W x 0.5 hr

E = 287.5 kW

E = 0.2875 kWh

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There are two significant figures in the measurement.

We know that volume is the space that a compound occupied. Now the number of significant figures refers to the number of nonzero values that we have in a measurement. It is the number of values that we can be able to assign a mathematical place value to.

In this case, we have the number in the question written as 0.0450. Our concern is to find out the number of significant figures hence we look out for the nonzero values and we have that there are two significant figures in the measurement.

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Answer:

The Earth's magnetic field is generated in the fluid outer core by a self-exciting dynamo process. Electrical currents flowing in the slowly moving molten iron generate the magnetic field.

Explanation:

\(hii\)

have a nice day ✌️

Answer:

The answer is "6:45 and 7:15".

Explanation:

In the given attache file two clocks are added, that's explanation defined as follows:

In the left image, it may assume, that the clock only at the right-hand side of a scene is move-in its previous position, which is shown to the left, as it was at 6:45 on the left but in the right image it will display the time that is 7:15.

Point B on the standing wave is referred to as a node. The correct option is B.

In a standing wave, a node refers to a point or region of minimal or zero amplitude. It is a point where the displacement of the wave is always zero, and it remains stationary as the wave oscillates. At a node, the particles or elements that make up the medium through which the wave is propagating do not experience any displacement from their equilibrium positions.

Nodes occur due to destructive interference between two waves of equal frequency and amplitude traveling in opposite directions. The superposition of these waves results in the formation of a standing wave pattern, characterized by nodes and antinodes.

Nodes are important features of standing waves and have several properties:

Fixed position: Nodes maintain a fixed location within the standing wave pattern and do not move as the wave oscillates.

Zero displacements: At nodes, the amplitude of the wave is zero, and there is no displacement of the medium particles or elements.

Energy concentration: Nodes are regions of low energy in a standing wave. The energy of the wave is primarily concentrated in the regions between the nodes, known as antinodes.

Separation distance: The distance between adjacent nodes in a standing wave is equal to half the wavelength of the wave.

Therefore, The correct answer is option B.

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She must be sure to  use an insulator like rubber and to rub the insulator on hair or fur to transfer charge when performing the demonstration. Hence, option (B) and (E) are correct.

When a subatomic particle is exposed to an electric and magnetic field, its electric charge causes it to feel a force.

Protons and electrons are the most prevalent charge carriers for the positive and negative forms of electric charges, respectively.

Hence, Marya must be sure to  use an insulator like rubber and to rub the insulator on hair or fur to transfer charge.

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Answer:

D. trying to eat healthier foods

Explanation:

Answer:

suppose the

quantity of water on the earth is 1.32 1021 kg and remains constant

the

Answer:

312.5 ft

Explanation:

x = xo + vo t + 1/2 a t^2        xo = 0         v0 = 0

x = 1/2 a t^2 = 1/2 (25)(5^2) = 312.5 ft

Answer:

It will remain in straight-line motion at constant speed until acted on by an

external force. Moreover, it'll not only tend to do that ... it'll actually do it.

Explanation:

Answer:

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Explanation:

The orbital speed of an ice cube in the rings of Saturn is 11.2 Km/s. The correct answer is option C

The speed of an object travelling around a circle depends on two quantities namely;

Given that  an ice cube in the rings of Saturn. The mass of Saturn is 5.68 x 10^26 kg, and use an orbital radius of 3.00 x 105 km. (G= 6.67 × 10-11 N·m2/kg2)

The given parameters are:

Let us first calculate the gravitational field strength on the Saturn.

g = GM/r²

Substitute all the necessary parameters and convert km to m

g = (6.67 × \(10^{-11}\) × 5.68 × \(10^{26}\)) ÷ (300000 × 1000)²

g = 3.79 × \(10^{16}\) ÷ 9 × \(10^{16}\)

g = 0.421 m/s²

The  orbital speed will be

V² = gr

V² = 0.4211 × 300000 × 1000

V² = 126333333.3

V = √126333333.3

V = 11239.8 m/s

Convert it to Km/s by dividing the answer by 1000

V = 11239.8/1000

V = 11.2 Km/s

Therefore, the orbital speed of an ice cube in the rings of Saturn is 11.2 Km/s

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Answer:

a) - 72.5°c

b) pressure = 3625.13 Pa

c) density =  0.063 kg/m^3

d) it is a subsonic aircraft

Explanation:

a) Determine Temperature

Temperature at 19.5 km ( 19500 m )

T = -131 + ( 0.003 * altitude in meters )

  =  -131 + ( 0.003 * 19500 ) = - 72.5°c

b) Determine pressure and density at 19.5 km altitude

Given :

Po (atmospheric pressure at sea level )  = 101kpa

R ( gas constant of air ) = 0.287 KJ/Kgk

T = -72.5°c ≈ 200.5 k

pressure = 3625.13 Pa

hence density = 0.063 kg/m^3

attached below is the remaining part of the solution

C) determine if the aircraft is subsonic or super sonic

Velocity ( v ) = \(\sqrt{CRT}\)  =  \(\sqrt{1.4*287*200.5 }\) = 283.8 m/s

hence it is a subsonic aircraft

Answer:

Lightning can kill people or cause cardiac arrest. Injuries range from severe burns and permanent brain damage to memory loss and personality change.

Lightning happens when the negative charges (electrons) in the bottom of the cloud are attracted to the positive charges (protons) in the ground.

Answer:

I think some drawbacks are that since there are no solid walls meaning it is weak and if murphy's law is in place, the water will destroy the substance. Tsunami waves also happen very quickly so even if the water can travel thru the substance quickly, it probably won't be quick enough. This design could help if the wave is smaller because less destruction would occur.

Explanation:

yeah

Answer: F=400 N

Explanation:

F=ma ==> F=force, m=mass, a=acceleration

F=100*4

F=400 N

Answer:

in this case the weight of the vehicle does not change , consequently the friction force should not change

Explanation:

The friction force is a macroscopic manifestation of the interactions of the molecules between the two surfaces, this force in the case of solid is expressed by the relation

          fr = μ N

          W-N= 0

          N = W

as in this case the weight of the vehicle does not change nor does the Normal one, consequently the friction force should not change

42 times must he repeat this exercise to burn off the energy in one slice of pizza.

What is energy?

Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.

Energy burn by the weightlifter = potential energy

Potential energy = mgh

Potential energy = 25.(9.8)(0.50)

Potential energy = 122.5 Joule.

Assume 25% of efficiency so energy burn = 122.5*25/100

energy burn = 30.625 joule

Number of times = 1260/30.625

Number of times = 42 times.

42 times must he repeat this exercise to burn off the energy in one slice of pizza.

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Given data

*The given battery voltage is V = 6 V

*The given resistor is R = 8 ohm

The formula for the current flow through the resistor is given as

Substitute the values in the above expression as

Thus, the current flow through the resistor is I = 0.75 A, and the correct answer is (D)

The theory that has been proposed that would explain the neurology of memory are;

The neurophysiology of learning  can be described as the theory that cover the three main cognitive processes and this can be regarded as core value of the the information processing system.

It should be noted that the  information processing system usually make use of the  brains  which helps to remember information through attention, perception and all this are found in the functionality of the brain system in the human system.

Therefore, All of these are correct.

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Answer:

Trawler B should set off on a course of 120°.

Trawler A is traveling at 20km/h on a bearing of 60°. This means that Trawler A is traveling north-east. Trawler B is traveling at 25km/h. In order to intercept Trawler A, Trawler B must travel on a bearing of 120°. This means that Trawler B must travel south-east.

The two trawlers will eventually meet at a point that is 40km east of Trawler A's starting position and 20km north of Trawler B's starting position.

The terminal velocity of the sphere is approximately 22.68 mph.

The terminal velocity of a sphere is the constant speed at which the gravitational force pulling the sphere down is balanced by the drag force pushing the sphere up. The drag force is proportional to the velocity of the sphere, and can be calculated using the following formula:

Fd = (1/2) * rho * Cd * A * v²

where Fd is the drag force, rho is the density of the fluid (air in this case), Cd is the drag coefficient (which depends on the shape of the object), A is the cross-sectional area of the object perpendicular to the direction of motion, and v is the velocity of the object.

The gravitational force pulling the sphere down is given by:

Fg = m * g

where m is the mass of the sphere and g is the acceleration due to gravity.

At terminal velocity, the drag force is equal in magnitude to the gravitational force, so:

Fd = Fg

Substituting the expressions for Fd and Fg and solving for v, we get:

v = √((2 * m * g) / (rho * Cd * A))

where A = pi * r² is the cross-sectional area of the sphere, and r is the radius of the sphere.

Plugging in the given values, we get:

v = sqrt((2 * 0.6 * 9.81) / (1.2 * 0.47 * pi * 0.3²)) ≈ 10.13 m/s

To convert this to mph, we multiply by 2.23694:

v ≈ 22.68 mph

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Given:

The number of more electrons than protons is n = 4000000

Required: Net charge on the object

Explanation:

The net charge on an object is given by the formula

Here, e is the charge of an electron and its value is

On substituting the values, the net charge on the object will be

Final Answer: The net charge on the object is 6.4e-13 C

Answer:

The  value is  \(\theta_2 = 20.322^o\)

Explanation:

From the question we are told that

  The angle of the first order maximum is  \(\theta _1 = 10.0^o\)

Generally the condition for constructive interference is  

     \(dsin\theta = n \lambda\)

Here  d is the separation between the slit ,

n  is the order of maxima  with values n  =  1, 2 , 3 ... for first , second , third ... order of maxima

    Now for first order of maximum

        \(dsin\theta_1 = \lambda \ \ ... \ \ ( 1)\)

=>      \(dsin(10) = \lambda \ \ ... \ \ ( 1)\)

    Now for second order of maximum

       \(dsin\theta = 2\lambda \ \ ... \ \ ( 2)\)

dividing equation 1  by 2

      \(\frac{d sin (10)}{d sin (\theta_2 )} = \frac{\lambda}{2\lambda}\)

     \(\frac{ sin (10)}{ sin (\theta_2 )} = \frac{1}{2}\)

=>   \(2sin(10) = sin (\theta_2 )\)

=>    \(0.3473 = sin(\theta_2)\)

=>   \(\theta_2 = sin^{-1} [0.3473]\)

=>   \(\theta_2 = 20.322^o\)

Answer:

Frequency = 25 / 10 = 2.5 Hz

Explanation:

If the wave oscillates up and down 25 times in 10 seconds, then the frequency can be calculated as follows:

Frequency = Number of oscillations / Time

In this case, the number of oscillations is 25, and the time is 10 seconds. Therefore, the frequency is:

Frequency = 25 / 10 = 2.5 Hz

So the frequency of the wave is 2.5 Hertz, which means it completes 2.5 cycles or oscillations in one second.